回合数问题flex [英] Round Number problem flex

问题描述

这段代码有问题：

 <？xml version =1.0encoding =utf-8 >？; 
  xmlns：s =library：//ns.adobe.com/flex/spark 
 xmlns：mx =library：//ns.adobe.com/flex/mx
 showStatusBar =false
 width =250height =31> 
< s：layout> 
  paddingTop =10verticalAlign =middle/> 
< / s：layout> 
< fx：Script> 
<！[CDATA [
 [Bindable] 
 private var i：Number = 1.0; 
 
 private function click（e：MouseEvent）：void 
 {
 if（e.currentTarget == plus）
 i + = .1; 
 if（e.currentTarget == minus）
 i  -  = .1; 
} 
]]> 
< / fx：Script> 
     

当我点击'+ '我得到

1.1（OK）

1.2000000000000002（而不是1.2）

1.3000000000000003（而不是1.3）

1.4000000000000004 （而不是1.5）

1.5000000000000004（而不是1.5）

1.8000000000000005（而不是1.6）

1.7000000000000006（而不是1.7）

1.8000000000000007 （而不是1.8）

1.9000000000000008（而不是1.9）

2.000000000000001（而不是2.0）

...

而当我点击' - '我得到

0.9（OK）

0.8（OK）

0.7000000000000001（而不是0.7）

0.6000000000000001（而不是0.6）

0.5000000000000001（而不是0.5）

0.40000000000000013（而不是0.4）

0.30000000000000016（而不是0.3）

0.20000000000000015（而不是0.2）

0.10000000000000014（而不是0.1）

1.3877787807814457e-16（而不是0.0）

...

我改变我的f （b：







$ e.currentTarget == plus）
i = Math.floor（（i + 0.1）* 10）/ 10; （e.currentTarget == minus）
i = Math.floor（（i - 0.1）* 10）/ 10;
}

当我点击+或者只点击' - '

但是如果我点击' - '直到0.7和'+'，它会停留在0.7

点击' - ' ，它保持到0.8

为什么？我怎样才能以0.1递增或递减数字？

解决方案

尝试使用：

pre $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ （（i + 0.1）×10）/ 10; （e.currentTarget == minus）
i = Math.round（（i - 0.1）* 10）/ 10;
if
}

或者在Flex 4.5中：

 <？xml version =1.0encoding =utf-8？> 
  xmlns：s =library：//ns.adobe.com/flex/spark 
 xmlns：mx =library：//ns.adobe.com/flex/mx
 showStatusBar =false
 width =250height =31> 
< s：layout> 
  paddingTop =10verticalAlign =middle/> 
< / s：layout> 
< fx：Script> 
<！[CDATA [
 [Bindable] 
 private var i：Number = 1.0; 
 
 private function click（e：MouseEvent）：void 
 {
 if（e.currentTarget == plus）
 i + = .1; 
 if（e.currentTarget == minus）
 i  -  = .1; 
} 
]]> 
< / fx：Script> 
< fx：声明> 
 < / fx：声明>< s：Button id =pluswidth =30label =+click =click（event）/> 
  < / s：WindowedApplication> 
  

或者在Flex 4中：

 <？xml version =1.0encoding =utf-8？> 
  xmlns：s =library：//ns.adobe.com/flex/spark 
 xmlns：mx =library：//ns.adobe.com/flex/mx
 showStatusBar =false
 width =250height =31> 
< s：layout> 
  paddingTop =10verticalAlign =middle/> 
< / s：layout> 
< fx：Script> 
<！[CDATA [
 [Bindable] 
 private var i：Number = 1.0; 
 
 private function click（e：MouseEvent）：void 
 {
 if（e.currentTarget == plus）
 i + = .1; 
 if（e.currentTarget == minus）
 i  -  = .1; 
} 
]]> 
< / fx：Script> 
< fx：声明> 
 < / fx：声明>< s：Button id =pluswidth =30label =+click =click（event）/> 
  < / s：WindowedApplication> 
  

I have a problem with this code :

<?xml version="1.0" encoding="utf-8"?>
<s:WindowedApplication xmlns:fx="http://ns.adobe.com/mxml/2009"
                   xmlns:s="library://ns.adobe.com/flex/spark"
                   xmlns:mx="library://ns.adobe.com/flex/mx"
                   showStatusBar="false"
                   width="250" height="31">
<s:layout>
    <s:HorizontalLayout gap="10" paddingBottom="10" paddingLeft="10" paddingRight="10"
                        paddingTop="10" verticalAlign="middle"/>
</s:layout>
<fx:Script>
    <![CDATA[
        [Bindable]
        private var i:Number = 1.0;

        private function click(e:MouseEvent):void
        {
            if (e.currentTarget == plus)
                i += .1;
            if (e.currentTarget == minus)
                i -= .1;
        }
    ]]>
</fx:Script>
<s:Button id="plus" width="30" label="+" click="click(event)"/>
<s:Button id="minus" width="30" label="-" click="click(event)"/>
<s:Label text="{i}"/>

When I click on '+' I get
1.1 (OK)
1.2000000000000002 (instead of 1.2)
1.3000000000000003 (instead of 1.3)
1.4000000000000004 (instead of 1.4)
1.5000000000000004 (instead of 1.5)
1.6000000000000005 (instead of 1.6)
1.7000000000000006 (instead of 1.7)
1.8000000000000007 (instead of 1.8)
1.9000000000000008 (instead of 1.9)
2.000000000000001 (instead of 2.0)
...
And when I click on '-' I get
0.9 (OK)
0.8 (OK)
0.7000000000000001 (instead of 0.7)
0.6000000000000001 (instead of 0.6)
0.5000000000000001 (instead of 0.5)
0.40000000000000013 (instead of 0.4)
0.30000000000000016 (instead of 0.3)
0.20000000000000015 (instead of 0.2)
0.10000000000000014 (instead of 0.1)
1.3877787807814457e-16 (instead of 0.0)
...
I change my function by

private function click(e:MouseEvent):void
{
    if (e.currentTarget == plus)
        i = Math.floor((i + 0.1) * 10) / 10;
    if (e.currentTarget == minus)
        i = Math.floor((i - 0.1) * 10) / 10;
}

I get the right number when I click on only '+' or only on '-'
But if I click '-' until 0.7 and '+', it stays at 0.7
The same append when I click '-' until 0.9 when '+', it stay to 0.8

Why? How can I do to increment or decrement a Number by 0.1?

解决方案

Try to use:

private function click(e:MouseEvent):void
{
    if (e.currentTarget == plus)
        i = Math.round((i + 0.1) * 10) / 10;
    if (e.currentTarget == minus)
        i = Math.round((i - 0.1) * 10) / 10;
}

Or in case of Flex 4.5:

<?xml version="1.0" encoding="utf-8"?>
<s:WindowedApplication xmlns:fx="http://ns.adobe.com/mxml/2009"
                   xmlns:s="library://ns.adobe.com/flex/spark"
                   xmlns:mx="library://ns.adobe.com/flex/mx"
                   showStatusBar="false"
                   width="250" height="31">
<s:layout>
    <s:HorizontalLayout gap="10" paddingBottom="10" paddingLeft="10" paddingRight="10"
                        paddingTop="10" verticalAlign="middle"/>
</s:layout>
<fx:Script>
    <![CDATA[
        [Bindable]
        private var i:Number = 1.0;

        private function click(e:MouseEvent):void
        {
            if (e.currentTarget == plus)
                i += .1;
            if (e.currentTarget == minus)
                i -= .1;
        }
    ]]>
</fx:Script>
<fx:Declarations>
    <s:NumberFormatter id="numberFormatter" trailingZeros="true" fractionalDigits="1" />
</fx:Declarations><s:Button id="plus" width="30" label="+" click="click(event)"/>
<s:Button id="minus" width="30" label="-" click="click(event)"/>
<s:Label text="{numberFormatter.format(i)}"/>
</s:WindowedApplication>

Or in case of Flex 4:

<?xml version="1.0" encoding="utf-8"?>
<s:WindowedApplication xmlns:fx="http://ns.adobe.com/mxml/2009"
                   xmlns:s="library://ns.adobe.com/flex/spark"
                   xmlns:mx="library://ns.adobe.com/flex/mx"
                   showStatusBar="false"
                   width="250" height="31">
<s:layout>
    <s:HorizontalLayout gap="10" paddingBottom="10" paddingLeft="10" paddingRight="10"
                        paddingTop="10" verticalAlign="middle"/>
</s:layout>
<fx:Script>
    <![CDATA[
        [Bindable]
        private var i:Number = 1.0;

        private function click(e:MouseEvent):void
        {
            if (e.currentTarget == plus)
                i += .1;
            if (e.currentTarget == minus)
                i -= .1;
        }
    ]]>
</fx:Script>
<fx:Declarations>
    <mx:NumberFormatter id="numberFormatter" precision="1" rounding="nearest" />
</fx:Declarations><s:Button id="plus" width="30" label="+" click="click(event)"/>
<s:Button id="minus" width="30" label="-" click="click(event)"/>
<s:Label text="{numberFormatter.format(i)}"/>
</s:WindowedApplication>

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